mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Revert gincostestimate changes.

Browse Source
This commit is contained in:
Teodor Sigaev 2007-01-31 16:54:51 +00:00
parent b62f85691e
commit 61f621b506
1 changed files with 1 additions and 115 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

116
src/backend/utils/adt/selfuncs.c
View File

@ -15,7 +15,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/selfuncs.c,v 1.224 2007/01/31 15:09:45 teodor Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/selfuncs.c,v 1.225 2007/01/31 16:54:51 teodor Exp $
*
*-------------------------------------------------------------------------
*/
@ -76,7 +76,6 @@
#include <ctype.h>
#include <math.h>
#include "access/gin.h"
#include "catalog/pg_opfamily.h"
#include "catalog/pg_statistic.h"
#include "catalog/pg_type.h"
@ -5287,119 +5286,6 @@ gincostestimate(PG_FUNCTION_ARGS)
Cost *indexTotalCost = (Cost *) PG_GETARG_POINTER(5);
Selectivity *indexSelectivity = (Selectivity *) PG_GETARG_POINTER(6);
double *indexCorrelation = (double *) PG_GETARG_POINTER(7);
ListCell *l;
int32 nfullscan = 0;
/*
* GIN doesn't support full index scan.
* If quals require full index scan then we should
* return cost big as possible to forbid full index scan.
*/
foreach(l, indexQuals)
{
RestrictInfo *rinfo = (RestrictInfo *) lfirst(l);
Expr *clause;
Node *leftop,
*rightop,
*operand;
Oid extractProcOid;
Oid clause_op;
int strategy_op;
Oid lefttype,
righttype;
bool recheck;
int32 nentries;
/*
* For each clause it's needed to check operand
* for values to search in GIN. So, we should find
* extractQuery method to get values from operand
*/
Assert(IsA(rinfo, RestrictInfo));
clause = rinfo->clause;
Assert( IsA(clause, OpExpr) );
leftop = get_leftop(clause);
rightop = get_rightop(clause);
clause_op = ((OpExpr *) clause)->opno;
if (match_index_to_operand(leftop, 0 /* GiN has only one column */, index))
{
operand = rightop;
}
else if (match_index_to_operand(rightop, 0, index))
{
operand = leftop;
clause_op = get_commutator(clause_op);
}
if ( IsA(operand, RelabelType) )
operand = (Node *) ((RelabelType *) operand)->arg;
/*
* It's impossible to call extractQuery method for not yet
* known operand (taken from table, for example). In this
* case we can't do anything useful...
*/
if ( !IsA(operand, Const) )
continue;
if (!op_in_opfamily(clause_op, index->opfamily[0]))
continue;
/*
* lefttype is a type of index column, righttype is a
* type of operand (query)
*/
get_op_opfamily_properties( clause_op, index->opfamily[0],
&strategy_op, &lefttype, &righttype, &recheck);
/*
* GIN (as GiST) always has lefttype == righttype in pg_amproc
* and they are equal to type Oid on which index was created/designed
*/
extractProcOid = get_opfamily_proc( index->opfamily[0],
lefttype, lefttype,
GIN_EXTRACTQUERY_PROC );
if ( !OidIsValid(extractProcOid) )
continue; /* should not be */
OidFunctionCall3( extractProcOid,
((Const*)operand)->constvalue,
PointerGetDatum(&nentries),
UInt16GetDatum(strategy_op));
if ( nentries == 0 )
nfullscan++;
else if ( nentries < 0 )
{
/*
* GIN_EXTRACTQUERY_PROC guarantees that nothing will be found
*/
*indexStartupCost = 0;
*indexTotalCost = 0;
*indexSelectivity = 0;
*indexCorrelation = 0;
PG_RETURN_VOID();
}
}
if ( nfullscan == list_length(indexQuals) )
{
/*
* All quals are void and require full scan. So
* set max possible cost to prevent index scan.
*/
*indexStartupCost = disable_cost;
*indexTotalCost = disable_cost;
*indexSelectivity = 1.0;
*indexCorrelation = 0;
PG_RETURN_VOID();
}
genericcostestimate(root, index, indexQuals, outer_rel, 0.0,
indexStartupCost, indexTotalCost,